Combined lock and latch.



No. 697,|56. Patented Apr. 8, I902.

L. H. MULLIKIN.

COMBINED LOCK AND LATCH.

'Application filed Aug. 2'7 1901.}

(llo Model.)

WITNESSES: INVENTOI? I fiwg Zlcvzzz JLflfidk/hn,

I BY

ATTORNEY n45 uonms pnsns 00,, FNOTO-LIYHQ. WASHINGTON, n. c.

iUwrrnn STATES PATENT OFFICE.

LEVIN ll. MULLIKIN, OF TRAPPE MARYLAND.

COMBINED LOCK AND LATCH.

SPECIFICATION forming part of Letters Patent N 0. 697,156, dated April.8, 1902.

Application filed August 27, 1901. Serial N0.'73,472.' (N0 model.)

To all whom 2 2? may concern.-

Be it known that I, LEVIN H. MULLIKIN, a citizen of the United States,residing at Trappe, Talbot county, Maryland, have invented certain newand useful Improvements in a Combined Lock and Latch, of which thefollowing is a specification.

My invention relates that class of locks and latches shown in my PatentNo. 646,094, dated March 27, 1900, in which a knob-operated latch isheld in its thrown position againstretraction by means of a rotarytumbler or disk which can only be operated by a suitable key.

The object of the invention is to improve the construction of thelocking-tumbler by providing it with notches having one wall rounded orinclined to throw out the nose of the locking-dog and having the otherwall abrupt to prevent further rotation of the tumbler and stop it atthe moment the nose of the dog enters either notch, and so insure thetum bler always stopping at the nose of the dog instead of beingsometimes carried past it.

A further object is to provide the lockingdog with guide-arms to engagethe upper and lower walls of the lock-case and to prevent canting orrocking of said dog.

These objects I attain by the mechanism illustrated in the accompanyingdrawings, in which Figure 1 is a plan of the cylindrical lock with oneof its casing-sections or cover removed and the tumbler turned so as toallow the retraction of the latch, as shown in dotted lines. Fig. 2 is asimilar view with the tumbler or locking-disk turned so as to lock thelatch against retraction. Fig. 3 shows the dog for locking or retainingthe tumbler or disk in position. Fig. 4 is a detail perspective of thesaid tumbler or disk. Fig. 5 is a plan of the latch, thelocking-tumbler, and the tumbler-retaining dog from the side opposite tothat shown in Fig. 1. Fig. 6 is an edge view of the latch and thetumbler-retaining dog. Fig. 7 is a side elevation of the key.

A represents a cylindrical lock-case, adapted to enter a hole bored byan anger and formed in two longitudinal sections a, to, secured togetherby a screw a the section a being provided at its front end with a faceor attaching plate a B is the latch, having the usual beveled nose atits formed end, an open middle portion 1), connected to the nose by areduced member or shank b and having a yoke b at its rear and engaged bythe two-armed sleeve 0 of the knob-spindle O for retraction thereby inthe usual manner.

Upon the inner end of the latch-shank Z) is loosely placed the aperturedbearing-plate D, having a lug d and guide-arms (1 projecting rearwardlyfrom one edge, the said plate and its arms and lug constituting theretaining-dog for the locking tumbler or disk E. The arms 01* preventthe bearing-plate from canting and binding against the upper and lowerwalls of the lock-case. The plate D is further held in its properposition by means of opposed recesses (1, formed in the inner side wallsof the lock-case.

F is the latch-projectin g spring, mounted on the shank h and bearing atone end on the rear end of the nose of the latch and at its rear endbearing against the plate I).

The tumbler or disk E is formed with two hubs or trunnions e e, seatedin recesses e in cesses are intersected by the two keyholes e in thelock-case. The tumbler or disk E has a keyhole or slit 6 extendingthrough it and its hubs, and in order that these keyholes e 6 mayalwaysregister for the removal and insertion of a key E, I provide thetumbler or disk with two notches or recesses 6 2 into which the lug ortoe d of the locking-dog snaps when the disk or tumbler is in itslocking and inoperative positions. These recesses in my patentedconstruction were beveled on both sides, and so it was possible to turnthe tumbler a full revolution, which was found to be objectionable, forthe reason that the notches were then carried past the lug (Z. I nowbevel or round one wall only of each recess 6 and make the other wallabrupt, so as to form shoulders 6 which will engage the lug cl andalways hold the tumbler or disk E from further rotation whenever the lugd snaps into one of the notches. Thus the proper position of the saidtumbler or disk is positively insured without the necessity of theoperator listening to ascertain whether or not the dog had snapped intoa notch.

The latch Bis cutaway at the opposite sides of its open middle portion,as at I), so as to the inner faces of the lock-case, and these reoverliethe tumbler or disk and slide rear- Wardly over it when it is in theposition shown in Fig. 1, and the said tumbler or disk is provided witha raised rib or projection e adapted to rest behind shoulders I) Z),formed by the forward ends of the cut-away portions b and so prevent theretraction of the latch, as best shown in Fig. 2.

When the parts are in the position shown in Fig. 1, the latch operatesin the usual manner upon turning the knob-spindle; but when it isdesired to lock the latch against retraction the key is inserted fromeither side of a door into the tumbler or disk and then turned to rotatesaid tumbler and bring its rib or projection 2 against the shoulders I).In thus rotating the tumbler or disk the beveled walls of its notches 8will cause the toe or lug d of the retaining-dog to be forced awayagainst the action of spring F, as shown in dotted lines, Fig. 1, untilthe opposite notch or recess reaches the toe or lug, whereupon the diskor tumbler will be prevented from turnin'g farther and the said toe willsnap therein and hold the disk or tumbler with its keyhole in registerwith the casing-keyhole.

The combined lock and latch may be applied without the necessity forskilled labor, as it is only necessary to have an anger of the propersize and bore a round hole to receive the cylindrical lock-case. Theparts are few and not liable to get out of order.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-- 1. A combined lock and latch, comprisinga latch having an open middle portion, means for retracting andprojecting the latch, a rotary key-operated locking-disk underlying themiddle open portion of the latch and provided with a raised rib orprojection adapted upon the rotation of said disk to rest against theforward end of said open portion of the latch and prevent'itsretraction, and said disk having notches at opposite points in itsperiphery, one wall of each notch being beveled or rounded and the otherbeing abrupt to form a shoulder to prevent further rotation of the disk,a retaining-dog comprising a springpressed apertured plate provided witha toe or lug to snap into and be forced out of said peripheral notchesby the inclined walls thereof upon the rotation of the locking-disk,substantially as set forth.

2. A combined lock and latch, consisting in the divided cylindricalcasing having recesses in its inner walls near its forward end, keyholesin rear thereof, bearings at the inner sides of the casing intersectedby said keyholes andbearings at its rear end, a latch mounted in saidcasing and having a middle open portion, a forward shank and a yoke atits rear end, a knob-spindle sleeve mounted in the rear hearings toretract the latch, a spring on the shank to project the latch, alocking-disk having hubs turning in the middle bearings, a keyholeextending through the disk and its hubs to register with thecasingkeyholes,and peripheral notches in its periphery and on a line atright angles to its keyhole, one wall of each notch being rounded orbeveled and the other abrupt to form a shoulder to prevent furtherrotation of the disk, and a retaining-dog for the disk, comprising anapertured plate mounted on the shank in rear of the spring with its sideedges in the forward recesses of the casing and provided with a toe orlug to snap into and be moved out of the said notches by the beveledwalls thereof upon the rotation of the disk; and also having upper andlower guide-arm's e engaging the upper and lower walls of the lock-case;substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

LEVIN H. MULLIKIN.

Witnesses:

W. S. WILsoN, ALFRED T. VVILSON.

